Improvement in steam-engines



waited Stabat @tutti @Mire JOHN MAYRS OURRY, OF SOUTH FRAMINGHAM,MASSACHUSETTS, ASSIGNOR TO HIM- SELF, JOHN MCLAUGHLIN, -OE BROOKLYN, NEWYORK, AND DENNIS PHALEN,

OF VATERTOWN, MASSACHUSETTS.

Letters Patent No. 103,431, datedMay 24, 1870.

IMPROVEMENT IN STEAM-ENGINES.

The Schedule referred to in these Letters Patent and making part of thesame.

To all persons to whom these presents may come Be it known that I, J oHNMAYRs CURRY, of South Framingham, ofthe county of Middlesex and Stateof' Massachusetts, have made a new and useful invention having referenceto Steam-Engines', and do hereby declare the same to be fully describedin the following specification, and represented in the accompanyingdrawings, in whicht Figure 1 is a front elevation.

Figure 2, a transverse section, andv Figure 3, a longitudinal section ofa steam-engine provided with my invention.

In this engine the piston is a rectangular wing, projectiugfrom arocker-shaft, and working in a cylindrical case, the upper portion ofwhich constitutes the valve-chest, and contains a slide-valve and itsports.

By the` operation of the piston,-a reciprocating or oscillating motionwill be imparted to its shaft, and a crank ixed ou one end thereof.

In the drawings- A denotes the case of the engine, it consisting of acylindrical box or drum elevated in a bed-plate or frame, B.

A shaft, C, goes transversely through this cylinder,

' concentric with it, and is supported in boxes in the tops of standardsD D. This shaft has stuffing-boxes a a, arranged at the sides of thecase. I

The piston E projects downward from the shaft, and within the case, andfits closely at its edges and lower end to opposite sides and theperiphery of the interior of the case. Suchsides and end of the pistonmay he provided with metallic or other packing, to cause the piston towork steam-tight in the case. Over the shaft there extends across thecase a partition,!b.

Underneath the partition is an eduction-chamber, c, with ports orpassages d e at its opposite ends. These ports open communication withthe space f (above the partition b) and the space g below thc chamber c.

The said space f is the valve or steam-chest, while the space g is thatin which the piston travels or opcrates.

Edu'ction-ports h fi 'go through the partition b and open into theeduction-chamber c, which should have a steam-escape opening leading outof one' side of it and into an eduction-pipe which may be applied to thecase.

On the partition b is a slide-valve, F, which has three chambers, k l min it, to operate with the four ports of the valve-seat. The stem 'nofthe said valvel goes through astutng-box, o, fixed to the periphery ofthe case. This stem is jointed to the' connectingrod p of the yoke y ofan eccentric, r, xed on the flywheel shaft s of the engine.

At the upper part of the case is an inductiou-passage, t, through whichsteam for working the' engine is to be introduced. Y The shaft s,supported iny suitable boxes, has a flywheehu, fixed to it, and at oneend such shaft has a crank, c, which is connected with the engine-crankby a rod, w, pivoted to the two cranks.

The valve-chest f being supplied withvsteam, the operation of thevengine may be thus described:

On the valve being moved so as to uncover` one of the ports d e, thesteam will rush through such port into the cylindric sector g, and willact against and move 'the piston through such sector or space g. In sodoing, the steam will cause such a rotary motion of the fdy-wheelshaftas to` effect a movement of the valve, so as to cover the port lastopen and uncover the other of the two. Steam next will rush through ,thelatter port, and will drive the piston in a direction opposite to thatin which it .was previously moved. The exhaust steam will then be drivenout ofthe closed port through the valve, and into the eduction-chamber,fiom 'whence it will escape by the exit-pipe.

I claim as my invention- The arrangementA of the' slide-valve E, thepartition b, the eduction-chamber c, and the series of ports d e h i, asdescribed, in acirculal:` drum or case, A, and with respect to a wing orpiston, E, and shaft C to operate therein, the whole being as specified.

JOHN MAYRS CURRY.

Viitnesses:

It. H. EDDY, J. It. SNOW.

